How to draw the IIP3 versus bias current in spectre?

Discussion in 'Cadence' started by Bob WU, Nov 10, 2009.

  1. Bob WU

    Bob WU Guest

    Hello, everyone,

    Currently I am designing an single-ended LNA, I have used PSS+PAC and
    got the IP3, but how to draw the plot of IP3 versus bias current (or
    other variables) in spectre? Thank you very much for helping a noob...

    Best regards,
    Bob
     
    Bob WU, Nov 10, 2009
    #1
  2. Bob WU

    Andrew Beckett Guest

    Bob WU wrote, on 11/10/09 12:27:
    Hi Bob,

    Sweep the variable for the bias current via the PSS form (rather than sweeping
    input power - presuming you've got a good input power to measure the IP3 at,
    there's no need to sweep it to measure IP3).

    Then on the direct plot form, you can choose to measure the IPN - pick "Single
    Point Input Power" and specify the input power. Choose to plot "Points". Select
    the 3rd Order and 1st Order harmonic, and then plot - you'll get the IP3 versus
    the swept variable.

    Regards,

    Andrew.
     
    Andrew Beckett, Nov 30, 2009
    #2
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